Microstructure and ratcheting behavior of 6061 aluminum alloy laser-MIG hybrid welding joint

Duan, Chenfeng; Yang, Shanglei; Gu, Jiaxing; Xiong, Qi; Yuan, Wei

doi:10.1088/2053-1591/ab17f8

Cited by 16 publications

(6 citation statements)

References 28 publications

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“…Figure 4(b) shows the microscopic image near fusion zone (FZ). It can be seen from the figure that the grains grow on the surface of the BM in the semimelted state and grow along the direction of temperature gradient to the weld center in the form of columnar crystals, which is a typical cocrystallization feature [26]. e elongated columnar grains in the yellow ellipse of Figure 4(b) are about 110 μm in length, but only about 30 μm in width.…”

Section: Experimental Results and Analysismentioning

confidence: 93%

[Retracted] Microstructure and Fatigue Properties of 6061 Aluminum Alloy Laser‐MIG Hybrid Welding Joint

Fan

Yang

Zhu

et al. 2021

Advances in Materials Science and Engineering

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Laser-MIG hybrid welding of 6061-T6 aluminum alloy was carried out with ER4043 welding wire, and the microstructure and fatigue properties of the joint were studied. The grain size of HAZ is larger than that of base metal (BM) due to the influence of welding heat cycle. Snowflake-like equiaxed grains were found in the upper, middle, and lower parts of the welded joint (WJ). Based on the fatigue test with 1 × 106 cycles, the ultimate fatigue strength of BM and WJ is 101.9 MPa and 54.4 MPa, respectively. There are many pores with different sizes in WJ. The number of pores in the upper and middle parts of WJ is obviously larger than that in the lower part due to the influence of the cooling rate of the weld pool and the escape rate of pores. The porosity type is mainly metallurgical pores with regular morphology, which is mainly due to the bubbles formed by the evaporation of Mg elements and H2O in the oxide film on the BM surface. The fatigue fracture analysis shows that the main cause of fatigue crack is the near-surface pores with 460 μm and 190 μm, respectively. The existence of pores near the surface is equivalent to the formation of a large-scale prefabricated crack, resulting in serious stress concentration. The morphology of the grains around the pores has a great influence on the initiation and propagation of the fatigue microcracks.

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Section: Experimental Results and Analysismentioning

confidence: 93%

[Retracted] Microstructure and Fatigue Properties of 6061 Aluminum Alloy Laser‐MIG Hybrid Welding Joint

Fan

Yang

Zhu

et al. 2021

Advances in Materials Science and Engineering

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“…Weld joints are often the weak points in structures, especially when it comes to fatigue failure. As indicated in Figure S9, during uniaxial asymmetric stress cycling, progressive accumulation of plastic strain could happen along the strain axis. − In this section, the heterogeneity of accumulated local strain in weld joints is monitored by the organic MRL method under a series of stress-controlled cyclic tests with different stress conditions. The typical fluorescence response and local strain accumulation in weld joints under cyclic stress loading with mean stress of 270 MPa and stress amplitude of 230 MPa are shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Dynamic Visible Monitoring of Heterogeneous Local Strain Response through an Organic Mechanoresponsive AIE Luminogen

Zhang

Cao

Zhang

et al. 2020

ACS Appl. Mater. Interfaces

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Local strain concentration is critically important for damage formation of structural components. Therefore, it is of particular interest in developing the structural health monitoring (SHM) method for large-scale, full-field, and on-site monitoring of local strain response in complicated structural components in service. The present work investigated a SHM method based on a pure organic mechanoresponsive luminogen (MRL), 1,1,2,2-tetrakis(4-nitrophenyl)ethane, for heterogeneous local strain concentration. Invisible heterogeneous local strain response in complicated weld joints is transformed into visible fluorescence under monotonic tension and cyclic stress loading. The local strain (<15%) calculated by fluorescence intensity has a good agreement with the results obtained by the conventional digital image correlation method, indicating good measurement accuracy of the calibrated organic MRL method. The heterogeneity of local strain in complicated weld joints increases along with elongation and number of stress cycles. Moreover, the higher mean stress and stress amplitude can induce significantly higher accumulated local strain in the relatively soft fusion zone region. Compared with conventional strain measurement methods, the present organic MRL method opens up new possibilities for large-scale, full-field, and on-site monitoring of local strain concentration and damage in complicated structural components.

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“…The microhardness distribution of the welded joint from one side to the other side of the joint section is measured by HDX-1000 microhardness tester [30]. The load is 100 gf, the holding time is 15 s, and the measuring point is taken every 0.1 mm.…”

Section: Mechanical Testsmentioning

confidence: 99%

“…Figure 7 shows the response of cyclic strain to different stress amplitude and mean stress loading during the process of asymmetric cycle [30]. Figures 7(a)-(c) shows the cyclic stress-strain hysteresis loops for a constant mean stress with varying stress amplitudes.…”

Section: Cyclic Hardening/softening Behavior Testmentioning

confidence: 99%

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Microstructure and cyclic hardening/softening behavior of laser welded high strength steel joints under asymmetrical cyclic loading

Zhao,

Yang,

et al. 2024

Phys. Scr.

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The cyclic behavior of materials under load and its influence on the mechanical properties of materials have always been the focus of engineering research. In this study, high strength steel was successfully welded by laser welding. The microstructure of each region of the high strength steel DP590 post-welding was meticulously analyzed. Additionally, 500 cycles of low-cycle fatigue tests of laser welded high strength steel were carried out by using asymmetric stress control method. After fatigue test, tensile test shall be carried out on some samples. Under the specific combination of mean stress and stress amplitude, compare the specimens that have not been fatigue tested with those that have been fatigue tested, the change of properties of laser welded high strength steel joint under asymmetric cyclic load was analyzed. The results showed that, due to cyclic hardening, the tensile strength of the sample increased to 601 MPa and the yield strength to 325 MPa. Compared with the original sample, the tensile strength and yield strength of the sample after asymmetric cycling had increased by 8.65% and 31.3%, respectively.

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Microstructure and ratcheting behavior of 6061 aluminum alloy laser-MIG hybrid welding joint

Cited by 16 publications

References 28 publications

[Retracted] Microstructure and Fatigue Properties of 6061 Aluminum Alloy Laser‐MIG Hybrid Welding Joint

[Retracted] Microstructure and Fatigue Properties of 6061 Aluminum Alloy Laser‐MIG Hybrid Welding Joint

Dynamic Visible Monitoring of Heterogeneous Local Strain Response through an Organic Mechanoresponsive AIE Luminogen

Microstructure and cyclic hardening/softening behavior of laser welded high strength steel joints under asymmetrical cyclic loading

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